/*
 * Simple JavaScript Inheritance
 * By John Resig http://ejohn.org/
 * MIT Licensed.
 *
 ******************************************************
 * Example Usage
 ******************************************************
 var Person = Class.extend({
  init: function(isDancing){
    this.dancing = isDancing;
  },
  dance: function(){
    return this.dancing;
  }
});

var Ninja = Person.extend({
  init: function(){
    this._super( false );
  },
  dance: function(){
    // Call the inherited version of dance()
    return this._super();
  },
  swingSword: function(){
    return true;
  }
});

var p = new Person(true);
p.dance(); // => true

var n = new Ninja();
n.dance(); // => false
n.swingSword(); // => true

// Should all be true
p instanceof Person && p instanceof Class &&
n instanceof Ninja && n instanceof Person && n instanceof Class

 ******************************************************
 */

// Inspired by base2 and Prototype
(function(){
  var fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/ : /.*/;

  // The base Class implementation (does nothing)
  this.Class = function(){};


  // Create a new Class that inherits from this class
  Class.extend = function(prop) {
    var _super = this.prototype;

    // Instantiate a base class (but only create the instance,
    // don't run the init constructor)
    initializing = true;
    var prototype = new this();
    initializing = false;


    // Copy the properties over onto the new prototype
    for (var name in prop) {
      // Check if we're overwriting an existing function
      prototype[name] = typeof prop[name] == "function" &&
        typeof _super[name] == "function" && fnTest.test(prop[name]) ?
        (function(name, fn){
          return function() {
            var tmp = this._super;

            // Add a new ._super() method that is the same method
            // but on the super-class
            this._super = _super[name];

            // The method only need to be bound temporarily, so we
            // remove it when we're done executing
            var ret = fn.apply(this, arguments);
            this._super = tmp;

            return ret;
          };
        })(name, prop[name]) :
        prop[name];
    }

    // The dummy class constructor
    function Class() {
      // All construction is actually done in the init method
      if ( !initializing && this.init )
        this.init.apply(this, arguments);
    }

    // Populate our constructed prototype object
    Class.prototype = prototype;

    // Enforce the constructor to be what we expect
      Class.prototype.constructor = Class;

    // And make this class extendable
    Class.extend = arguments.callee;

    // EXTENSION BY Draw2D.org to inject methods into an existing class to provide plugins or
    // bugfixes for further releases
    //
    Class.inject = function (prop) {
        var proto = this.prototype;
        var parent = {};
        for (var name in prop) {
            if (typeof (prop[name]) == "function" && typeof (proto[name]) == "function" && fnTest.test(prop[name])) {
                parent[name] = proto[name];
                proto[name] = (function (name, fn) {
                    return function () {
                        var tmp = this.parent;
                        this.parent = parent[name];
                        var ret = fn.apply(this, arguments);
                        this.parent = tmp;
                        return ret;
                    };
                })(name, prop[name]);
            } else {
                proto[name] = prop[name];
            }
        }
    };

    return Class;
  };
})();
